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We have a two pipe steam boiler system(boiler installed 1992). Prior owners removed regular baffle radiators in two rooms and installed baseboard runs(approx 8' long). One run has a piece(see attachment-looks like a large screw) that appears to be some sort of shut off/heat regulator, but it doesn't seem to affect the run when turned either way, it just spins and spins. It is not a bleeder as the other end of the run has that. This part leaks very badly and we are trying to remodel this room with laminate flooring. We took this picture to a local heating supply store and they were baffled, excuse the cliche. We want to replace this part to continue the remodel, but don't know what to replace it with. Please HELP! THANK YOU!